lcr meters

Stanford Research Systems

phone: (408)744-9040www.thinkSRS.com

· 0.05 % basic accuracy (SR720), 0.2 % (SR715)

· 5-digit display of L, C, R and Q or D

· Test frequencies to 100 kHz (SR720)

· Up to 20 measurements per second

· Binning and limits for parts sorting

· External capacitor bias up to 40 V

· RS-232 computer interface

· GPIB & Parts Handler interfaces (SR720)

· SR715 ... $1295 (U.S. list)

· SR720 ... $1495 (U.S. list)

The SR715 and SR720 LCR Meters measure passive components with as little as 0.05 % error. These easy-to-use instruments are quick to setup, adjust and calibrate. The SR715 and SR720 are ideal for applications such as incoming inspection, quality control, automated test, and general benchtop use. Front-Panel Display

A 5-digit LED display shows measured values, entered parameters, instrument status, and user messages. When making measurements, the major parameter (L, C or R) is shown on the left display and the appropriate minor parameter (Q, D or R) is shown on the right display.

Making Measurements

Measurements can be performed at test frequencies of 100 Hz, 120 Hz, 1 kHz, 10 kHz and 100 kHz (SR720 only). A built-in drive voltage can be set to preset values (0.1, 0.25 and 1.0 V) or adjusted from 0.1 to 1.0 V in 50 mV increments.

Measurements are taken at rates of 2, 10 or 20 samples per second. Consecutive readings can be averaged between two and ten times for increased accuracy. Both series or parallel equivalent circuit models of a component are supported. Capacitor measurements use either the internal 2.0 VDC bias or an external source of up to 40 VDC.

SR715 & SR720 LCR Meters

LCR MetersSR715 and SR720 — LCR meters with test frequencies to 100 kHz



Simple to Operate

The power and flexibility of the SR715/720 does not come at the expense of ease-of-use. A convenient AUTO measurement mode automates the selection of setup parameters and quickly determines the appropriate device model for whatever component is being measured. Up to nine instrument setups can be stored in non-volatile memory for quick recall at a later time.

Convenient Calibration

The SR715 and SR720 make it simple to compensate for lead impedance and stray fixture and cable capacitance. The null calibration procedure automatically corrects both open and short circuit parameters at all frequencies and all ranges. Binning

The SR715 and SR720 have built-in features to aid in component sorting. This is especially useful for production testing, incoming inspection, device matching, or when you need to test multiple devices of similar value. The meters allow you to sort components into as many as ten different bins.

The SR715 and SR720 support three types of binning schemes: pass/fail, overlapping and sequential. Pass/fail has only two bins: good parts and everything else. Overlapping (or nested) bins have one nominal value and are sorted into

progressively larger bins (e.g., ±1 %, ±2 %, ±3 %). Sequential bins can have different nominal values, each separated by a percentage or a nominal value and asymmetrical limits. Binning parameters are also easily stored in non-volatile RAM for quick setup in production environments.

Test Fixtures

The SR715 and SR720 have a kelvin fixture which uses two wires to carry the test current and two independent wires to sense the voltage across the device under test. This prevents the voltage drop in the current carrying wires from affecting the voltage measurement. Radial components are simply inserted into the test fixture, one lead in each side. Axial devices require the use of the axial fixture adapters (provided). Surface-mount devices, or components with large or unusually shaped leads, can be measured with optional SMD Tweezers (SR727) or Kelvin Clips (SR726). The tweezers and clips attach directly to the LCR meter’s front-panel test fixture. An optional BNC Fixture Adapter (SR728) allows you to connect a remote fixture or other equipment through one meter of coaxial cable.

Rear Panel

Two rear-panel input connections are provided for an external bias voltage. Voltages as high as 40 VDC can be used. An optional handler interface provides control lines to a component handler for sorting. A standard RS-232 interface allows complete control of all instrument functions by a remote computer. A GPIB interface is included with the handler option.

SR715 and SR720 LCR Meters

SR728 BNC Adapter

SR727 Surface Mount Tweezers

SR726 Kelvin Clips

SR720 rear panel



Fixture

Fixture 4-wire kelvin fixture for radial leaded parts with adapters for axial leaded parts.Fixture protection Protected up to 1 Joule of stored energy and 200 VDC (for charged capacitors). Fused at 0.25 A output current for biased measurement.

Calibration

Zeroing Open and short circuit compensationCompensation limits Short: R < 20 Ω, Z < 50 Ω, Open: Z > 10 kΩ

General Store and recall Store/recall up to nine complete instrument setups. RS-232 Standard interface. All instrument functions can be controlled or read over the interface. GPIB and Handler IEEE-488.2 and Handler interface. (SR720) Handler interface uses a DB25 connector, positive logic for binning and control.Operating temperature 0 °C to 35 °CRelative humidity <85 % Power 20 W, 100/120/220/240 VAC, 50 Hz or 60 HzDimensions 13.5" × 4" × 14" (WHD)Weight 10 lbs.Warranty One year parts and labor on defects in materials and workmanship

Measurement modes Auto, R+Q, L+Q, C+D, C+REquivalent circuit Series or parallelParameters displayed Value, Deviation, % Deviation or Bin Number (Deviation and % Deviation are calculated relative to a stored value.)Basic accuracy SR715: 0.2 %, SR720: 0.05 % Measurement Range

(R + Q mode) R 0.0001 Ω to 2000 MΩ Q 0.00001 to 50(L + Q mode) L 0.0001 µH to 99999 H Q 0.00001 to 50(C + D mode) C 0.0001 pF to 99999 µF D 0.00001 to 10(C + R mode) C 0.0001 pF to 99999 µF R 0.00001 Ω to 99999 kΩ Electrical Test frequency Fixed frequencies at 100 Hz, 120 Hz, 1 kHz, 10 kHz (SR715 and SR720), 100 kHz (SR720 only)Frequency accuracy ±100 ppmDrive voltage Preset levels: 0.10, 0.25, 1.0 Vrms Vernier: 0.1 to 1.0 Vrms with 50 mV resolutionDrive-level accuracy ±2 %Bias voltage Internal: 2.0 VDC ± 2 % External: 0 to +40 VDC, fused at 250 mA

Features

Averaging 2 to 10 measurementsMeasurement rate Slow, Medium, Fast: 2, 10 or 20 measurements per second at test frequencies of 1 kHz and above, and about 0.6, 2, 4 or 6 measurements per second at 100 Hz and 120 HzRanging Auto or ManualTriggering Continuous, manual or remote over RS-232, GPIB or Handler interface Binning Up to 8 pass bins, QDR and general fail bins, defined from the front panel or over the computer interfaces. Binning setup may be stored in non-volatile memory.

SR715 and SR720 Specifications

Ordering InformationSR715 10 kHz LCR meter w/ RS-232 $1295SR720 100 kHz LCR meter w/ RS-232, $1495 GPIB and parts handler interface SR726 Kelvin clips $500SR727 Surface mount tweezers $300SR728 4-wire BNC adapter $300

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